This picture pops up in various little internet archives of vintage spanking pictures, but I’m always uncertain just how vintage it actually is. The look of pain on her face looks much more dynamic and less posed than one usually sees in the truly vintage photos:

I agree. The only things demonstrably antique are the sofa and the length of his pant legs. Maybe the carpet. But the open collar, the slip-on shoes, her expression, and her posture (less demure than most in such photos), all point to a much more recent date.